Pipe cutter



Patented Sept. 17, 1929 UNITED STATES PATENT OFFICE IRA. W. NONNEMAN, OF WARREN, OHIO, ASSIGNOR TO THE BORDEN COMPANY, OF

WARREN, OHIO, A CORPORATION OFOHIO PIPE CUTTER Application filed February 29, 1928. Serial No. 257,936.

This invention relates to a pipe cutting tool of the type having a suitable frame carrying a rotarycutting knife and a pipe engaging guide, whereby cutting is effected by bodily moving the tool about a clamped pipe and periodically forcing the cutter knife toward the pipe. The object of the invention is to increase the efiiciency and speed of cutting of such tool. I effectthis by pro- Viding a plurality of cutters which simultaneously act on the pipe. They are so arranged that one feeding action applies to all of them. Accordingly, the pipe is simul-' taneously cut at more than one point and a speedier severance is obtained.

I preferably provide two rotary cutting knives substantially diametrically opposite each other and two non-cutting guide rollers also substantially diametrically opposite each i other and located intermediately of the knives. One guide roller and one knife are preferably carried by a floating frame which may be moved by the feed screw toward the pipe, with the result that the pipe is forced against the other knife and guide roller, and thus one screw controls the feed of both knives.

The invention is hereinafter more fully described in connection with a preferred embodiinent illustrated in the drawings.

In the drawings, Fig. 1 is an edge view of my pipe cutter, and Fig. 2 is a side elevation thereof. These two views show the cutter operating on a comparatively small size pipe; Fig. 8 is a side elevation of the same cutter operating ona comparatively large size pipe; Figs. 4 and 5 are cross-sections of the cutter on planes indicated by the lines a 44 and 55 respectively on Fig. 3.

The frame of the cutter comprises an elongated yoke 10 terminating at one end in a bifurcation 11 and at the other in an internally threaded sleeve 12. Pivoted in the bifurcation is a block 20 which is itself bifurcated in two directions at right angles to each other to provide four arms 21, 22, 23 and 24:. Rotatively mount-ed between the arms 21 and 22 is a central guide roller 80, and rotatively mounted between. the arms 28 and 2st and centrally thereof is a cutter 40.

On the other side of the pipeis a floating block 50, and bifurcated similarly to the block 20 and thus having a pair of arms 51 and 52 between which is mounted a cutter and a pair of arms 53 and 5&1 between 5 which is mounted a guide roller 70. V The block 50 is pivoted at 81 to a pair of links 80, the other ends of which are pivoted at 82 to the frame 10.

The handle and feed screw 90 is threaded 60 in the sleeve 12 and bears against the outer edge of the floating block '50.

It will be seen that the two cutters 40 and 60 are diametrically, opposite each other, I and the rollers 30 and 70 are also diametrically opposite each other. When the feed screw is turned in, the knife 60 and the roller force thepipe against theknife 40 and the roller30, so that the pressure is equalized on these four members compris ing the two knives and the two rollers. This action is independent of the size of the pipe, as illustrated by the small pipeA in Fig. 2 and the large pipe A in Fig. 3.

It is convenient to make the block arms 21 and 22 embracing the guide roller 30 and the arms 53 and 54 embracing the guide roller 70 with such distance between the inner faces that they longitudinally. p0si :.v tion the roller, allowing between them thev desired freedom of movement. These rollers are preferably freely rotatable on pins 100, which may be held in place by cotter pins 101 which preferably occupy recesses as 102 l in the outer face of the arms. The construction is similarin regard to the rotary knives, the block arms being made thicker so as to centralizethe knife,fland the'knife being freely rotatable on a pin 105 which is likewise held by cotter pins 106 occupying recesses 107 in. theoutcrface of the arms' By the simple mounting just described, the walls of the recesses prevent the rotation of the cotter pins, andthese pins thereby prevent rotation of the journal pins and also prevent longitudinal shifting of them. Accordingly, the knives and guide rollers r0 tate on the journal. pins but are prevented from longitudinal displacement by the arms of the respective bifurcated blocks. The

removal of a cotter pin enables the removal of the corresponding journal pin and the removal of the corresponding knife or guide roller. This is particularly valuable in the case of the knives, as it enables them to be readilyreplaced when they become dull.

fvIy tool is operated in a manner similar to that of the usual pipe cutter. The pipe is clamped in the vice and the feed screw 90, which also constitutes the handle, is

screwed out until the knives and rollers may be movedacross the pipe into proper position, and then the feed screw is turned in to cause the desired snug engagement, and the device is bodily revolved about the pipe, partial rotation being given to the screw handle with each revolution, or oftener as desired.

I claim: 1 1. In a pipe cutter, the combination of a portable frame, a plurality of rotary cutting knives carried thereby, a plurality of non-cutting guide members carried by the frame and positioned alternately with the knives, and a single feeding device for feeding said knives into the pipe.

2. In a pipe cutter, the con'ibination of a frame adapted to be swung about the pipe, a pair of rotary pipe cutting knives on op posite sides of the pipe, and a pair of noncutting rollers on opposite sides of the pipe, and a single feeding device for causing both knives to cut into the pipe simultaneously.

3. In a pipe cutter, the combination of a frame adapted to be swung about the pipe, a pair of rotary pipe cutting knives carried thereby on diametricallyopposite sides of the pipe, and a pair of non-cutting rollers carried by the frame on diametrically opposite sides of the pipe, and a single feedscre'w threaded in the frame for causing both knives to cut into the pipe simultaneously.

4. In a pipe cutter, the combination of a yoke, a non-cutting roller and a rotary knife carried thereby and adapted to engage a pipe on one side, a block movably carried by the yoke, a rotary knife and a non-cut ting roller carried by the block and adapted to engage the pipe on the opposite side, and means adapted to engage said block and force it against the pipe.

5. The combination with a yoke, of a block pivoted thereto, a rotary cutting knife and a non-cutting roller carried by said block in position to engage one side of a pipe, a block located'on the opposite side of the pipe and carryin a rotary cutter and a non-cutting roller, means movably connecting the last mentioned block with the yoke, and means for moving said last mentioned block.

6. The combination with a yoke, of a block pivoted thereto, a rotary cutting knife and a non-cutting roller carried by said block in position to engage one side of a pipe, a block located on the opposite side of the pipe and carrying a rotary cutter and a non-cutting roller, a pair of links pivotally connecting the last mentioned block with the yoke, and a feed screw threaded in the yoke and abutting against the last mentioned block.

7. In a pipe cutter, the combination of a frame, a block pivoted thereto and having two pairs of arms, a non-cutting guide roller rotatably mounted between one pair,

a cutter knife rotatably mounted between the other pair, a second block having two pairs of arms, a rotary cutter rotatably mounted between one pair, a non-cutting guide roller rotatably mounted between the othervpair, the cutter of one block being diametrically opposite that of the other, and the guide roller of one block being diametrically opposite the other, and a pair of links pivoted at one end to the second block and at the other end to the yoke.

8. In a pipe cutter, the combination of a frame, a bifurcated block pivoted thereto, a non-cutting roller and a rotary cutter independently journalled in the bifurcations of the block, a floating block bifurcated and having a rotary cutter and a non-cutting roller journalled therein, the last mentioned cutter and guide roller being in the reverse vertical position to those of the first block, said floating block being movably connected to the yoke and a feed screw mounted in the yoke for engaging the floating block.

9. In a pipe cutter, the combination of a frame in the form of an elongated yoke, a block pivoted to the yoke, a second block movably connected with the yoke, the two blocks having bifurcations facing each other, four journal pins mounted in the two blocks extending across the recesses of the blocks, a noncutting roller and a rotary cutting knife mounted on the pins of the first block, and a non-cutting guide roller and a rotary guiding knife mounted on the pins of the second block, the rotary members in one block being in the reverse vertical direction of those of the other block.

In testimony whereof, I hereunto affix my 

